We are migrating from Exchange 2010 to Office365. We migrated a mailbox that is now in the cloud, but we cannot send him a larger attachment because his remote mail user contact shows a 5GB limit. The setting is greyed-out and not seeing a way to change it. The O365 mailbox does not show that restriction, but does anyone have any ideas on how to remove a greyed-out message size restriction on a remote user mailbox?

